I’m trying to figure out what kinds of longitudinal INGO membership data has been collected for particular types of INGOs.
We have data on Human Rights INGOs, for instance, which Christine and Kiyo used in their 2004 Social Forces paper. And, we have data on environmental INGO memberships that David and Ann collected (and David is now updating). David is also in the process of collecting longitudinal data on memberships in INGOs related to law, women, gay/lesbian, and psychology INGOs.
What else has been collected?
EDIT: Minzee Kim reminds me that she collected child rights INGO membership at 5-year intervals over the last 25 years.